[LLDB] Add formatters for MSVC STL std::shared_ptr (#147575) This PR adds formatters for `std::shared_ptr` and `std::weak_ptr`. They are similar to the ones from libc++ and libstdc++. [Section from MSVC STL NatVis](https://github.com/microsoft/STL/blob/313964b78a8fd5a52e7965e13781f735bcce13c5/stl/debugger/STL.natvis#L512-L578). To support debugging with PDB debug info, I had to add an early exit in `GetDesugaredSmartPointerValue`, because with PDB, LLDB doesn't know about template types. This isn't an issue here, since the typedef type is already resolved there, so no casting is needed. The tests don't check for PDB - maybe this should be changed? I don't know a good way to do this. PDB has the downside that it resolves typedefs. Here in particular, the test for `element_type` would need to be replaced with `User` and `std::string` with `std::basic_string<char,std::char_traits<char>,std::allocator<char> >`. Towards #24834.
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